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Net Income Per Share(Tables) | 9 Months Ended
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Sep. 30, 2013
Net Income Per Share [Abstract] |
Reconciliation of the Common and Potential Common Shares Outstanding Used in Earnings Per Share Calculation | A reconciliation of the average number of common and potential common shares outstanding used in the calculations of basic and diluted net income per share follows ($ in millions, shares in thousands):
| Three Months Ended |  | Nine Months Ended
| September 30, 2013 |  | September 30, 2012 |  | September 30, 2013 |  | September 30, 2012
Numerator (basic and diluted): |  |  |  |  |  |  |  |
Net income | $ | 29.1 |  |  | $ | 27.7 |  |  | $ | 85.8 |  |  | $ | 63.3 |
Less: Dividends paid to participating securities | (0.1 | ) |  | — |  |  | (0.2 | ) |  | (0.1 | )
Less: Undistributed earnings available to participating securities | (0.2 | ) |  | (0.3 | ) |  | (0.6 | ) |  | (0.7 | )
Undistributed and distributed earnings available to common stockholders | $ | 28.8 |  |  | $ | 27.4 |  |  | $ | 85.0 |  |  | $ | 62.5 |
Denominator: |  |  |  |  |  |  |  |  |
Average number of common shares outstanding | 31,092.6 |  |  | 30,659.9 |  |  | 31,042.2 |  |  | 31,097.4 |
Effect of dilutive stock-based compensation | 187.7 |  |  | 392.7 |  |  | 171.1 |  |  | 362.9 |
Average number of common and potential common shares outstanding | 31,280.3 |  |  | 31,052.6 |  |  | 31,213.3 |  |  | 31,460.3 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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